Concrete mixer



G. ROUTLEDGE ET AL Nov, 20, 1928.

CONCRETE MIXER Filed May 14, 1928 ENTORS:

A FTBRNEY Patented Nov. 20, 1928.

UNITED STATES PATENT? OFFICE. f

GERALD ROUTLEDGE, or oAxLANn'ANn AXEL o. NORLING, or ALAMEIDA, CALIFOR-NIA, ASSIGNORS 'ro HUTCHINSON co, 0F OAKLAND, CALIFORNIA, a CORPORATION.

ooNoRETE MIXER.

Application filed y 14,

tion extending into the drum body and is pro vided with a plurality ofperforations through which the water is forced to the'drum interior tobe combined with the contents thereof by the revolvingraction of thedrum,

Due to the clogging of these perforations by particles of cement, sand,and small stones contained in the mixer, it is often impossible to forcesufficient water through these'perforations and into the contents of thedrum, which causes improper mixing of the contents and the consequentshutting down of the machine until the drum supply pipe can be cleaned.i 7

Our improved device consists of a small screw conveyer secured at oneend to'the interior wall of the mixing drum and adapted to revolvetherewith with its free end projecting into the stationarywatersupplypipe' in such manner that the interior of said pipe will be keptclear of all foreign matter which may enter by ways of the pipeperforations, the perforations themselves being also keptclear and thewater in the pipe thus kept flowing freely the full length thereof,thereby causing an even distribution of waterto the mix within therevolving drum. I

The primary object of our invention is the provisionof improved conveyormeans adapted for positioning in the water supply pipe of a concretemixer drum and for rotation with said drum in such manner that thesupply pipe will at all times be kept clear of any and all foreignmatter which may become lodged in the porforations thereof, thus tendingto provide for even and proper distribution of water to the mix at alltimes. i

Another object of our invention is to'provide a simple and eflicientconveyer device for concrete mixers which may be easily applied toordinary forms of mixers and which will function in a. positive mannerto properly distribute water to the interior thereof to insurecontinuous and proper operation of the mixing drum.

Other objects and advantages of our invention will be apparent withreference to the 1928.4 serial No. 277.775.

subjoined detailed description taken in connection with the accompanyingone sheet of drawings, in which Figure 1 is an axial sectionillustrating a common form of concrete mixer and showing our improvedscrew conveyor in position within the water supply pipe of the revolvingdrum. The view also includes the driving means for the mixer, also itsroller supports Figure 2 is an enlarged sectional detail showing themixer end of the screw conveyor and the outer end of the water supplypipe in which it is mounted for rotation relative to such pipe;

Referring with greater particularly to the drawings, thenumeral 5designates the mixer in a: general way, which comprises in detail, theusual revoluble drum 6 having interior arranged vanes 7 adapted toagitate the contents of the drum, One end of the drum '6 is providedwith the usual cone shaped section 8 and opening 9 and the oppositeend-is provided with an axial bearing member 10 surrounding thewaterfeed pipe 11. The drum 6 is rotata-bly mounted upon rollers 12 and 13which carry its \veight so that it may be rotated about the axiallydisposed pipe 11 which projects into the drum and is held stationaryrelative thereto in the usual manner.

The drum is provided at its rear end with the usual annularly arrangedrack; 14 which meshes with a driving pinion 15 carried by the drivingmechanism 16, through which means rotation of the mixing drum isaccomplished in the usual manner. The supply line 17 communicates withthe horizontally disposed pipe 11 and both are held rigid and againstrotation in any suitable manner not shown. 1 a

Our improved conveyer member 18 comprises, an elongated screw member 19mounted in the pipe section 11 and extending throughout its entirelength, said screw being preferably formed from a single piece oftwisted metal and having a stem 20 at its outer end extending throughthe cap 21, which forms a bearing therefor, and is rigidly secured tothe drum end 4 by means of a spider or the like, 22 having a centrallydisposed hub 23 for its reception and to which it is rigidly secured bymeans of a set screw 24:.

When in operation, the drum 6 is rotated about the stationary pipe 11 bythe driving means 16, which rotary movement causes the V rotation of thespider 22 and screw 19 and ing into said pipe, and adapted to facilitatethe consequent-rotation of the screw within the pipe 11. This rotarymotionof the screw 19 tends to dislodge particles of cement which.

The above described rotary movement of the screw 19 continues as long asthe drum this in operation and this continuous motion of the screwcauses the agitation of the water column in the pipe 11 and assists theeven distribution of the water to the various perforations 25 arrangedthe whole length. of

the pipe 11 and also carries the larger par-- ticles of foreign matterto the end slot 26 at; which point they are dischargedinto the m1x.

act terms required by law, and believing that it comprises novel, usefulandvaluable improvements in the art to which it pertains, we here statethat we do not wish to be limited to the precise construction andarrangement of the several parts, as-herein-set forth, as the same maybevariously modified by a skilled mechanic without departing from thespirit andscope of our invention as'defined in the appended claims.

WVhat we claim and following, to wit 7 1. A concrete mixer having arevoluble drum and a water supply pipe and a screw conveyer carried bysaid drum and extendthe distribution of water to said drum; I

2. A concrete mixer having a-reyoluble drum, a stationary water supplypipe ar-' Having thus described our invention, andan embodiment of 1t,1nthe full, clear andexdesire to secure by Letters Patent of the UnitedStates, is the esaeso ter column therein to facilitate its distributionto said perforations. and to prevent the clogging thereof by particlesfrom the agitated mix n said drum. 3 p

3. In combination with a concrete mixer having a revoluble drumrotatable about a carried by theouter end thereof, and means forrotating said drum and screw member.

to cause the agitation ofthe Water column in said pipe and the evendistribution thereof to the various perforations and the simultaneousdislodgment off -particles of cement and gravel therefrom. V

4:. In a-device of the class described, a stationarywater supply: pipeand a mixing drunr mounted for rotation thereon, means n the form ofascrew. carried by one endot' said drum and adapted for rotary actioninusaid pipe, discharge perforations arranged inspacedrelationthroughout the length of said pipe and a slot arranged inoneend thereof, and means for rotatin said drum and screw to cause theforcing of water along Said pipe.

and through spaced perforations/ 5. In a device of the class described,a stationary hollow water supply pipe having .a cap at oneendandconnected at its opposite end to a suitable supply source, said pipebeing provided with evenly spaced preforations and said cap with a slot,and a screw'member extending throughsaid and adapted for rotary motioninfsaid pipe to evenly distribute. the water column in said pipe to theperforat-ions therein and tocause the discharge.

through. said slot of all foreign particles which may enter saidperforations from exterior sources. i J p In testimony that we claim theforegoing we have hereto set our hands this 4th day of May; v

GERALD noUTLnDsn. AXEL o, uonmne.

